Porcelain toilets are the first thing that crack because there's zero stretch in the very rigid porcelain, is similar to glass, and it will crack down low in the trap, down at the floor.
Is best to pour a pint of pink recreational vehicle antifreeze, $2.58 gal, into the toilet and into the water closet, after you pump out all the water with a boat bailer pump, hand pump out tool.
Ditto this for the bath tub and shower, drain trap. The boat bailer hand pump comes with a 36" long, thin flexible red tube, good for getting down into the bath tub drain trap.
Hey ...... today is September 21, 2020 ...... so, it is still S-U-M-M-E-R ....... and winter is way far, three months away! Autumn 2020 officially starts tomorrow on Tuesday, September 22, at 9:30-am ...... according to
www.timeanddate.com. At 12-noon on September 22, 2020, the sun will be directly overhead at the equator, like down there in the mountains of Ecuador ..... where Juan Valdez and his happy donkey grow the mountain coffee beans, just for you.